Rod tapering machine



Filed Dec. 1, 1954 April 10, 1956 e. M. DICK 2,741,075

ROD TAFERING MACHINE v 4 Sheets$heet 1 I08 "0 I07 I06 I8 Fla. 1

INVENTOR GEORGE M. DICK HIS ATTORNEY April 0, 1956 e. M. DICK 2,741,075

ROD TAPERING MACHINE Filed Dec. 1, 1954 4 Sheets-Sheet 2 O K N 53 R c m M M V E m G wm E G om 37 N U T r r L 8. N2 3 mm m: Nu

HIS ATTORNEY G. M. DICK April 10, 1956 ROD TAPERING MACHINE Filed Dec. 1, 1954 4 Sheets-Sheet 3 INVENTOR GEORGE M.D|CK M- HIS ATTORNEY April 10, 1956 e. M. DICK 2,741,075

ROD TAPERING MACHINE Filed Dec. 1, 1954 4 Sheets$heet 4 i if I 1 :1 c0 //O) o w 2 03 :Z a j N 0 IO c INVENTOR GEORGE M. DICK HIS ATTORNEY United States Patent 6 non TAPERING MACHINE George M. Dick, Sherbrooke, Quebec, Canada, assignor to Ingersoll-Rand Company, New York, N. Y., a corporation of New Jersey Application December 1, 1954, Serial N 472,484

7 Claims. (Cl. 51-144) This invention relates to rod tapering machines, and moreparticularly to a machine to taper the end portion of a drill steel or similar rod.

It is one object of this invention to provide a machine of this type capable of automatically feeding the drill rod into the grinder.

A second object of this invention is to provide such a grinder which is pivotable about an axis parallel to the longitudinal axis of the drill steel and pivotable about an axis perpendicular to the axis of the drill steel to permit adjustment of feeding of the steel into the grinder and adjustment of the taper being ground on the steel.

Further objects will become apparent in the following specification and drawings in which i Fig. l is, in part, an end view of a preferred form of the rod tapering machine, and in part, a transverse view of Fig. 4 taken along the line 11 looking in the direction of the arrows,

Fig. 2 is a side view of the machine, part of this view being a section of Fig. 1 taken along the line 22 looking in the direction of the arrows,

Figs. 3 and 4 are top and side views, respectively, of the machine, and

Fig. 5 is a longitudinal sectional elevation of the chuck of the machine.

Referring to Figs. 1 and 2 of the drawings, the rod tapering machine disclosed is shown as comprising, in general, a frame pivotally mounted on a table 12 on an axis parallel to the longitudinal axis of the frame. A chuck 14 adapted to receive a drill rod 16 is mounted on the frame 19 and connected to be rotated by an air motor 20 through a positive drive 13. The chuck 14 is moved longitudinally to feed the drill steel into a grinder 22 by means of an air motor 24 connected between the chuck 14 and the frame 10, whereas movement of the frame 19 about its longitudinal pivotal axis to permit adjustment of sidewise positioning of the steel relative to the grinder is obtained by means of a manually operated adjusting device 26 mounted on the table 12 and pivotally connected to the frame 10.

Referring in greater detail to the construction of the rod tapering machine, the stationary support, or table 12, upon which the machine is mounted is of conventional form with legs 28, side plates 38 and top 32. The frame 10 shown comprises a box shaped bed 34 having at each end depending legs 36 pivotally connected at their free ends 38 to bearings 46 bolted to the table top 32. It is to be noted that the bearings 4d are in axial alignment with each other and in spaced parallelism with the longitudinal axis of the bed 34 such that the bed may be pivoted about this axis to move the drill steel away from and toward the grinder 22.

Such movement of the bed is accomplished by means of the manually operated adjusting device 26 (see Fig. 1) which comprises a bolt 44 threaded at one end in a pin 46 pivotally connected to the frame 10 by brackets 48.

The opposite end portion of the bolt 44 extends through a pin 50 pivotally supported by brackets 52 secured to the table top 32. The bolt 44 is secured against endwise movement relative to the pin 50 by a bolt flange 54 bearing against one side of the pin 50 and a hand wheel 56 secured to the end of the bolt 44 and bearing against the opposite side of the pin 50. Thus any rotation of the hand wheel 56 threads the bolt 44 into or out of the pin 46 to move the bed 34 away from or toward, depending upon the direction of rotation of the hand wheel, the grinder 22.

An adjustable stop 49 is provided to limit pivotal movement of the bed in the direction of the grinder 22 so that the extent of grinding of the steel may be limited to the desired amount. The stop 49 shown includes a bracket 51 bolted to the table and having a bolt 53 threaded through the upper end to contact the bed 34.

As was previously noted, the chuck 14 is slidable longitudinally of the bed 34. In furtherance to this end the longitudinal marginal portions of the upper side of the bed 34 are provided with V-shaped slots 58 to receive complementary shaped flanges 6% on a mounting plate 62 thereby providing a slidin interlocking connection between the bed 34 and the mounting plate 62. Bolts 59 are threaded through one fiange 69 to bear against an insert or to permit adjustment of the sliding fit between the bed 34 and plate 62.

Longitudinal movement of the bed plate to feed the drill rod 16 into the grinder 22 is obtained by a conven-' tional air motor 24. The motor 24 shown is of the piston type and accordingly includes a casing 64 mounted on the frame 19 and housing a reciprocatory piston 66 with a piston rod 68 extending through the end of the casing and bolted to a flange 70 secured to an end of the mounting plate 62. The piston 66 is actuated by compressed air supplied to the casing 64 by a pipe 72 from a pressure source (not shown). Movement of the chuck 14 in the feeding direction is limited by means of a bolt thread ed through a bracket 67 depending from the outer end of the plate 62, the inner end of the bolt 65 being located to strike the bed 34. Thus, the length of the taper ground on the steel may be varied by merely adjusting the length of the portion of the bolt 65 extending through the bracket 67.

In order to insure a relatively constant rate of feeding of the steel into the grinder regardless of fluctuations in' pressures of air supplied to operate the motor 20, a piston type dash pot 74 is secured to the frame 10 and connected to the flange 70. The dash pot shown comprises a fluid tight casing 69 housing a reciprocable orificed piston 71 with a piston rod 73 extending through an end of the casing for connection with the flangeJ J. Mounted on the frame it for movement therewith is the chuck 14 (best seen in Fig. 5). The chuck 14 includes a tubular housing 76 surrounding a tube 78 rotatively supported at its opposite ends by bearings 8t} and. held in position against longitudinal movement by nuts 81 threaded on the tube 73 and abutting against the inner races of the bearings 80.

Mounted concentrically within the tube 78 is a pipe 82 externally threaded at its outer (or left) end portion 84 to receive a hand wheel 86, and internally threaded at its gitudin'ally'into 'the' grinding wheel.

rod-by means of the-handwheel 86. In furtherance to this end the hand wheel is'provided with a sliding interlocking connection with the tube 7-th connection here shown comprises a shoulder 98 on the hand wheel 86"frtted in e -peripheral groove 100 in'the tube 78-such that rotation of the hand-wheel 86 threads thepipe 32 into or out ofthe hand wheel, depending upon thedirec tion'of rotation of the hand wheel, to move the collet along the cam surfacei d to grip or release a drill steel. A-cap 192 threaded on the end of the tube 73-prevents the operator from inadvertently threading the .pipe'too far in the forward directionsuch that it comes out of the hand wheel. This cap 132 is also provided with an opening 163through which the rod 36 extends such that the cap 102 serves additionally to support the rearwardend portion of the steel.

Rotation of the tube 78 'by'the air motor Zllis facilitated'by means of the driving connection 18 (see Fig. which comprises a sleeve 1G4 keyed to the tube '78 and having a circumferential gear 1% meshing with a worm gear 108 on the drive shaft 119 of the air motor 28. The casing 107 of the motor Ztlis bolted to the housing 76 so that the motor is carried by and moves longitudinally with the chuck 14. It is to be noted that the sleeve 104 is positioned such that its ends bear against the opposed surfaces of the inner races of the bearings 89 so that it serves the additional purpose'of positioning these races.

:In. order to permit rotation of the chuck 14 about a radial axis, or an axis perpendicular to the longitudinal axis of the chuck, to obtain adjustment of the degree of taper formed on the end of the drill steel, the chuck is adjustablylmounted on the-plate-62 (see Fig. 1). In

furtherance to this end, the chuck is provided with a base 124 loosely fitted between parallel flanges 126 along the longitudinal edges of the plate 62. Adjusting screws 128 are threaded through each end of the flanges 126 to bear against the four corners of the base 124. Thus by adjusting the screws 128, the chuck 14 may be cocked such that its longitudinal axis lies at an angle to the longitudinal axis of'the bed 34, .or more particularly the longitudinal axis of thexdrill steel is inclined with respect to the surface 130 of the grinding belt 112. Accordingly as the drill steel is fed into the grinding belt 112, a taper will be ground on the drill'steel, the angle of the taper being determined by the position of the longitudinal axis of the chuck relative to the longitudinal axisof the bed 34.

The grinder shown'by way of illustration is of the belt type with the belt 112 encircling an idler wheel 118 and a driving wheel 114 rotated by a motor 116 mounted on the table 12. .The idler :wheel 118 is mounted on arm 122 pivotally connected to aleg 28 of the table 12, and a weight 120 mounted on:the arm122 tends constantly to rotate the idler Wheel in adirection away from the driving Wheel114 so that the belt 112 is constantly under tension.

Reviewingthe operation of the rod tapering machine, the. hand wheel 86 is rotatedto move the collet S8 forward to .openthecollet to receive adrill rod 16, and the hand wheel. 56. is rotated to pivot the chuck away from the grinding beltso that the drill. steel may be readily inserted intotthe chuck14. The hand wheel 86 is then rotated tomove the collet rearward, or to the left, such that the cam elements 92 force the collet into firm gripping contact with the drill rod. Thereafter the hand wheel Stiis rotated'and the airmotor '24 is operatedito position the drill rod with-its end just touching the near edge of the grinding belt 1'12'tl1is assumes ,thatthe chuck has been previously positioned'by the screws 128 for the desired angle oftaper to be ground on the steel. .Ihei'eafter the airm0t0r20is started to rotate the chuck and steel and the'airmotor 24 is actuated to feedthe rotating steel lon- When the .chuck reaches'theend of its stroke, as determined by settingstop 65, the motor 24 isreversed andthe hand wheel 56 rotated topivot the drill steel towards'the grinding surface pregrinder.

paratory to again feeding the steel longitudinally into the This process .is continued untilv the. bed .-34.-:-is pivoted against the stop 49 atwhich time the proper length and angle of taper will be ground on the drill steel.

I claim:

1. A rod tapering machine comprising a frame pivoted on a longitudinal axis, a grinding element having a grinding surface, a chuck slidably mounted on said frame for movement substantiallyparallel tosaid' axis to feed said rod along said surface and adapted to receive a rod .tolbe tapered, a motor connected to move the chuck relative to the frame to feed the rod along :the grindingelernent, meansconnected to said frame for positioning the frame on its pivot, and a'motor connected to rotate the chuck.

2. A rod tapering machine. comprisingta frame pivoted on a longitudinal axis, means for securing the chuck to the frame and adapted to adjust the position of the chuck about an axis substantially perpendicular to said longitudinal axis, a motor connected to move the chuck relative to the frame to feed the rod into a grinding element, means connected to said frame for positioning the frame on its pivot, and a motor connected to-rotate the chuck.

3. A rod tapering machine comprising a frame, a grinding element having a grindingsurface, a mounting/element on said frame and movable longitudinally relative thereto substantially parallel to said surface, a chuck adaptedto receive a rod to be tapered, means for securing the-chuck to the mounting element and adapted to adjust the position of the chuck relative to the mounting element to vary the angle of the longitudinal axis of the rod relative-to said surface, -a motor conne'cted to move themounting element longitudinally relative'to the frame, and a'motor connected to rotate the chuck.

4. A rod tapering machine comprising a framefa chuck'slidably mounted on said frame and adapted-to receive a rod to be tapered, a fluid operated piston con nected to move the chuck longitudinally relative to-the frame, means connected to said frame and to said chuck to resist longitudinal movement of the chuck in one direction, and a motor connected to rotate the chuck.

5. A rod tapering machine comprising a frame pivoted on a longitudinal axis, a grinding element having a plane grinding surface, a mounting element mounted -ou said frame andslidable thereon in a direction substantially in line with .said plane, a chuck adapted to receive a rod to be tapered, means for securing the chuck tothe mounting element and adapted to adjust the=position of the chuck about agradialxaxis thereofto varyathe angle ofthelongitudinal axis of the rod relativetosaid surface, a motor connected tomovethe-rnounting element longitudinally-relative to. .the'frame to feed theroda-loug the grinding surface, means connected :tosaid framefor positioning the frame on its pivot,.and a motor connected to rotate the chuck.

.6. A rod tapering machine comprising a stationarysupport, a frame pivotal about a longitudinalgaxiszand mounted on said support, a mounting element-zslidabletou said frame, a chuck adapted to receive a rod to-be tapered,

means for securing the chuck to themountiuglele'ment and adapted to adjust the position ofthe chuck-abouta radialaxis thereof, a motor connected tomove the mounting element longitudinally relativeto the frame, :atmember having a threaded pivotal connection withthe. frameanda longitudinally relative to the frame, a dash pot connected to resist movement of said plate, a member having a threaded pivotal connection with the frame and a pivotal connection with said support for positioning the frame about its pivot, a gear on said chuck, and a motor having 5 a driving connection with said gear for rotating the chuck.

References Cited in t e ii UNITED STATES PATE Sibley Ian. 1,

291,235 701,821 Vogel June 3, 1902 988,071 Beugler Mar. 28, 1911 

